Implement CrankIndicator from Lua's CoreLib/UI

[kaylanx]

Implement CrankIndicator from Lua's CoreLib/UI

Might be good to figure out a way to separate this out into a separate sub package, then game devs can decide to pull in the indicator or not.

Changes Scale to an enum to be more swifty, no point in having if statements like

 if !([1, 2, 4, 8].contains(scale)) {
                System.error("scale must be 1, 2, 4, or 8")
                scale = 1
            }

when an enum can make that redundant.

[finnvoor]

looks great, thanks for the PR!